You and your usual group, which consists of Hina and Takemichi, went to the bowling center. You were really having a good time until a stranger joined your game.

It was Hakkai. And it was not even clear why Takemichi behaved strangely when he first saw him. However, you decided not to disturb them and sat down with Hina on the sofa. You also saw one girl, whose name is Yuzuha. She and Hakkai are brother and sister. And you even became friends!

Hakkai seemed to really enjoy bowling because he didn't want to leave even because of Yuzuha's excuse. But you still managed to get out of there. The Shibas invited you to walk to their house and you agreed. Which seems to be in vain..

As you approached their house, you saw many strange people in white suits standing near it and it seemed like they were waiting for someone. Hakkai and Yuzuha's faces instantly changed, and you felt a tall silhouette approaching you from behind.

"Who did you bring to us, Ha~kkai?"